Experimental Study of Insulation Composite Materials Electrical Properties in Liquid Nitrogen

In this paper we are presenting experimental measurement results of capacitance and dissipation factor of composite materials at liquid nitrogen temperatures. Samples of twenty-six composite insulation materials are tested at room and cryogenic temperatures. Investigated materials are put in liquid nitrogen bath setup which is made by 3D printing. The experimental setup consists of an insulating material sample which is put between two metal electrodes in liquid nitrogen environment. Capacitances and impedance angle $\theta$ are measured between two electrodes at 2.5 mm distance with RLC meter at 1 kHz. From measured angle $\theta$ and capacitance the dissipation factor and permittivity are calculated for each sample.